But if that's the case then his sister would have already rolled down the stairs, and it says she went downstairs after he shot his mom. So I think it's still his mom he shot first.

The guy is not a stenographer retelling the story from a fact sheet. His sister was probably shot on the stairs, I mean look at the size of his house. Those stairs can go for days. So then she gets up or crawls all the way down the stairs, I mean it's not rocket science. He popped her and she fell, and he went downstairs without knowing her exact coordinates. Later, she reappeared. Seems pretty simple to follow.

he shot his sister and she tried running down the stairs but then tumbled down it, she landed in the mid platform and he shot her again. he went to kill his mom. his sister got up, walked down the rest of the stairs and started screaming. then he shot her dead

This little piece of shit. He only seems to be concerned about his own well-being. This is going to "mess me up."

It's strange how the most heinous crimes in the world, such as matricide, are mostly committed by Caucasian teen males.

Oh, well. I guess I'll be one of the few people who take that into notice while everyone else ignores it, but when a Middle Eastern person kills someone, a black dude shoots someone, a Hispanic stabs someone, etc., the rest of you can simply say, "What's new? They do that all the time."